Grinding wheel



Jan. 12, 1965 A. LABOWSKY GRINDING WHEEL Filed Aug. 28, 1962 INVENTOR3,164,933 GRINDING WHEEL Andrew Labowslry, 144 Emeline Drive, Hawthorne,NJ.

Filed Aug. 28, 1962, Ser. No. 219,902 1 Claim. c1. s1 z09 This inventionrelates to improvements in bonded diamond grinding wheels, and, moreparticularly, to the concept of increasing the surface area of the corebody to which it is secured in such a manner as to substantiallylengthen the life of the grinding surface by improving the coolingthereof.

Heretofore, many and varied efforts have been made to control the flowof air over the body of different types of grinding wheels as well as toattempt to direct air toward the cutting edge thereof to achieve alonger life for the grinding wheel. By way of example, it is known inthe prior art to employ carbon dioxide gas as the cooling medium, thisgas being directed against the cutting edge from a suitable supplysource by any convenient nozzle means.

To employ fan blades on a grinding wheel for the purpose of cooling thework contact face thereof is also known in the prior art. A morespecific example of such an arrangement is that shown and described inThomas Patent No. 2,746,220, issued May 22, 1956. In this patent, thereis disclosed an arrangment in which a series of blades are spacedly andfixedly secured to the surface of a grinding wheel which is providedwith a frusto-conical supporting body. In this teaching, the blades areof such a configuration as to direct the flow of air through aperturesprovided beneath the cutting face directly to the work being ground. Tosome degree it is suspected that this device has merit and utility, butas in all designs that have preceded the present concept, it also hasdrawbacks. The mere application of fan blades, in any form whatsoever,to the surface area of a grinding wheel will tend to reduce theefliciency of that particular wheel. By way of elucidation, grindingwheels of the type which include fan blades as a cooling means will ofnecessity operate at a reduced peripheral speed which will result inexcessive wear. Furthermore, unless extreme care is used in constructingthe wheel, whereby it is perfectly balanced, damage will be'caused tothe shaft on which the grinding wheel is revolubly supported. It is,moreover, apparent that the use of fan blades as the cooling means forsuch grinding wheels will also be a safety hazard not only to theoperator, who could be seriously injured, but also to the work whichcould be irreparably damaged.

Accordingly, it is the primary object of the invention to construct arotary grinding tool having a body portion and a cutting surface, thegreater proportion of said body portion being provided withheat-dissipating means.

It is a further object of the invention to provide recessed or channeledareas in the periphery of a grinding wheel thus increasing the areathereof for contact with surrounding atmosphere air.

Still another object of the invention is to provide a grinding wheelwhich is economical to manufacture with readily available tools andmachinery.

These and other objects and advantages will be clearly understood withreference to the embodiments illustrated in the accompanying drawingemploying similar reference numerals to identify the same elements ineach of the similar views, and in which:

FIG. 1 is a perspective view of a frusto-conical grinding wheelincorporating the invention therein;

FIG. 2 is an elevational view of a grinding wheel incorporating one formof channel, illustrated as a spiral;

FIG. 3 is a sectional view of the grinding wheel shown in FIG. 2.

3,164,933 Patented Jan. '12, 1965 With reference to FIG. 1, there isdisclosed a frustoconicalgrinding wheel including a trailing edge F ofwellknown design to the leading edge which is suitably secured in aknown manner, a resinoid bonded diamond concentrate grinding element,indicated by the reference character G. Although as illustrated in thedrawing the grinding wheel is frusto-conical in configuration, this isnot to be considered as restrictive of the inventive concept, but merelyrepresentative of any type of grinding wheel which has a core body ofsuflicient area to be adapted for receiving the improvement contemplatedand disclosed herein.

Further, with regard to FIG. 1, there is shown in this perspective viewa parallel spaced array of channels or recesses H which serve to revealor expose the surface area of the core body I of the grinding wheel F,thus enabling air to contact a greatly increased area thereof.

In the elevational view of the embodiment of the invention shown in FIG.2, the recessed area in the core body I of the grinding wheel F assumesthe form of a continuous and uninterrupted spiral I. This type ofgroove, as well as the others discussed herein, can be readily achievedon any conventional lathe or ground into the core body on any convenientgrinder. Where desired or preferred by the manufacturer, the recesses orgrooves may be molded into the core body. In the embodiment of theinvention shown in FIG. 2, the grooves are clearly shown as U-shaped,this arrangement substantially increasing the cooling surface area onthe periphery of the grinding wheel by 50%60%.

During tests that have been conducted for the purpose of evaluating thisimprovement, the results of which are set forth hereinafter, it wasdetermined that there was such a substantial increase in efiiciencythat, whereas standard grinding wheels could not be handled after usewith bare hands, those which were prepared by the teaching of thisinvention had achieved heat dissipation to a degree that made itpossible for them to be handled with bare hands.

The tests referred to above were conducted with the type of grindingwheel shown in the drawing and all operating conditions were maintainedconstant with the only variable being in the grooves applied to thegrinding wheel. In the tests three (3) grinding wheels were chosen withthe conventional or standard core design and dry tests were run on %1"square tungsten carbide until a total of 0.125" was removed with eachwheel and then an accurate measurement was made to determine the amountof each grinding wheel that had been consumed. Subsequently, these samethree (3) grinding wheels were grooved in the manner discussed hereinand the tests repeated under the exact same conditions with thefollowing results:

No Grooves, Increase Wheel No. Test No. Grooves, inch Efliciency,

inch Percent or scope of the invention as defined in the appended claim.

I claim:

In a rotary grinding tool, a frusto-conical body having a leading edgeand a trailing edge the leading edge including an annularly channeledarea, an abrasive material positioned in said channeled area With theouter surface of the abrasive material forming a continuation of thebody and extending beyond the leading edge thereof and heat dissipatingcontinuous spiral groove means extending substantially from the trailingedge of the body and terminating at a point substantially adjacent tothe channeled area confining said abrasive material.

4 References Cited by the Examiner UNITED STATES PATENTS 2,307,312 1/43Whiting 51209 2,746,220 5/ 56 Thomas 51266 2,800,754 7/57 Robertson51209 3,016,662 1/62 Ellis 51209 3,110,985 11/63 Brauchle 512663,117,400 1/ 64 Martin 51209 10 LESTER M. SWINGLE, Primary Examiner.

FRANK H. BRONAUGH, J. SPENCER OVERHOLSER,

Examiners.

